Which part of the diesel engine (mechanical pump, electronic injection pump) is controlled by the accelerator pedal? What principle makes the crankshaft speed up!

To control the amount of fuel injected by the fuel injection pump, the engine relies on the spark plug to ignite the gasoline in the cylinder and explode, pushing the metal rod in the cylinder (forgot its official name) to drive the transmission shaft to rotate, so there is a torque, which is actually When talking about torque in physics, the definition of torque is the force transverse to the rotation circle multiplied by the radius of the motion circle. It is the thrust brought by this torque that drives the car to accelerate and move forward. It goes through the gearbox, transmission mechanism and forum. These can be understood as gears of different sizes. The rotating torque is finally transformed into the friction between the tires and the ground to push the car. thrust. Because the diameter of the tire and the gear ratios on the transmission are fixed, the only thing that is variable is the gearbox. For the sake of demonstration, we assume that the gear radius of the gearbox 1-5 is 1-5 respectively. Ignoring the losses in the transmission process, according to the idiot identity of torque = torque (F0*R0=F1*R1)..., if we want the car to have greater acceleration, we need the car to obtain greater propulsion, but F0 on the left *R0 is the torque that the engine can output. The method is to reduce R1, that is, by changing the gear size of the gearbox that receives the engine power. This process is what we call shifting. As for why the automatic transmission is not as good as the manual transmission in terms of speed and fuel consumption, just because of the current technology, the power loss of the automatic transmission is higher than that of the manual transmission. I seem to remember somewhere that the effective power of the automatic is 88%, while the effective power of the manual is still 93%. 95%.